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Publication numberDE4208751 A1
Publication typeApplication
Application numberDE19924208751
Publication date11 Nov 1993
Filing date20 Mar 1992
Priority date27 Feb 1992
Publication number19924208751, 924208751, DE 4208751 A1, DE 4208751A1, DE-A1-4208751, DE19924208751, DE4208751 A1, DE4208751A1, DE924208751
InventorsFritz Karl Hausser
ApplicantFritz Karl Hausser
Export CitationBiBTeX, EndNote, RefMan
External Links: DPMA, Espacenet
Reducing resistance to aerofoil or hydrofoil passing through medium e.g. air or water - uses array of teeth formed on leading and/or trailing edge of aerofoil or hydrofoil section
DE 4208751 A1
The teeth on the leading edge of an aero/hydrofoil section ensures a smooth flow of the air/water over the section. The teeth on the trailing edge prevent the formation of eddies or turbulence. The shape, length, width, spacing and alignment of the teeth, as well as the number of rows of teeth, will depend on the size and speed of the section through the air/water. USE - Teeth on leading and trailing edge are used on rotors for jet motors and ventilator fans, and on boats and aircraft to reduce fluid flow resistance.
Claims(1)  translated from German
  1. Oberbegriff: Preamble:
    Gezahnte Fronten, Kanten oder Ränder von Körpern. Serrated fronts, edges or edges of bodies.
    Kennzeichnender Teil: Signing part:
    Vordere und/oder hintere gezahnte Rand eines Körpers zur Verringerung des Wasser- bzw. Luftwiderstandes. Front and / or rear toothed edge of a body for reducing the water or air resistance.
Description  translated from German
Titel Title

Gezahnte Fronten, Kanten oder Ränder von Körpern die mit dem selben Prinzip arbeiten wie die im Antrag P 42 06 066.4. Serrated fronts, edges or edges of bodies that work with the same principle as in the application P 42 06 066.4.

Stand der Technik State of the art

Rotoren von Jet-Antriebswerke, Ventilatoren, Boote, Flugzeuge, etc. haben gerade Kanten. Rotors of jet propulsion thrusters, fans, boats, airplanes, etc. have straight edges.

Problem Problem

Der angegebenen Erfindung liegt das Problem zugrunde, den Wasser- bzw. Luftwiderstand bei obengenannten Körpern zu vermindern. The specified invention is to reduce the water or air resistance at the above-mentioned objects the problem.

Erzielbare Vorteile Achievable benefits

Die mit der Erfindung erzielten Vorteile bestehen insbesondere darin, daß der vordere gezahnte Rand eines Körpers die Luft oder Wasser sanfter schneidet und/oder der hintere gezahnte Rand die Wirbelbildung herabsetzt. The advantages achieved by the invention are in particular that the front serrated edge of a body of air or water softer cuts and / or the rear serrated edge reduces the formation of vortices. Dadurch wird die Leistung deutlich verbessert. Thus, performance is significantly improved. Form, Länge, Breite, Abstand und Ausrichtung der Zähne sowie die Anzahl der Zahnreihen hängt von der Größe und Geschwindigkeit des Körpers ab. Shape, length, width, spacing, and orientation of the teeth as well as the number of rows of teeth will depend on the size and speed of the body.

Ausführungsbeispiel Embodiment

Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen von den Anträgen P 42 06 066.4 und P 42 08 751.1 dargestellt. An embodiment of the invention is illustrated in the drawings of the applications P 42 06 066.4 and P 42 08 751.1.

Patent Citations
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DE420325C *19 Oct 1925Constantin MuskallaVorrichtung zur Daempfung von Randwirbeln an Flugzeug-Tragflaechen u. dgl.
DE2636056C2 *11 Aug 197621 Jul 1983Rhein-Flugzeugbau Gmbh, 4050 Moenchengladbach, DeTitle not available
DE2830371A1 *11 Jul 19788 Feb 1979Roger A ThompsonTragfluegelauftriebsvorrichtung
DE6940421U *13 Oct 196916 Apr 1970Heinrich HennigsLuftschrauben mit vermindertem luftwiderstand
DE9013099U1 *14 Sep 19907 Nov 1991Moser, Josef, 8058 Pretzen, DeTitle not available
FR681633A * Title not available
FR794841A * Title not available
FR2639902A1 * Title not available
GB329783A * Title not available
US1446011 *5 Jul 192120 Feb 1923Cattley Jackson RobertPropeller
US2800291 *20 Oct 195123 Jul 1957Stephens Arthur VeryanSolid boundary surface for contact with a relatively moving fluid medium
US4067518 *20 May 197610 Jan 1978Lockheed CorporationDrag reducer for lift surface of aircraft
US5088665 *31 Oct 198918 Feb 1992The United States Of America As Represented By The Administrator Of The National Aeronautics And Space AdministrationSerrated trailing edges for improving lift and drag characteristics of lifting surfaces
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
DE10027938A1 *31 May 200013 Dec 2001Dlr EvAerofoil section with lift-increasing trailing edge, in which trailing edge has spoilers on one or both sides to cause flow breakaway
DE19634296A1 *24 Aug 199624 Apr 1997Erich Dipl Ing UferAircraft fan jet propulsion unit
DE19634296C2 *24 Aug 199622 Apr 1999Erich Dipl Ing UferBläsertriebwerk für Flugzeuge mit Einrichtungen zur Grenzschichtabsaugung
DE19964114A1 *31 Dec 199919 Jul 2001Dlr EvAerofoil section with lift-increasing trailing edge, in which trailing edge has spoilers on one or both sides to cause flow breakaway
DE202009010904U1 *17 Aug 200930 Dec 2010Becker Marine Systems Gmbh & Co. KgTragflügel für Wasserfahrzeuge
EP2567892A3 *29 Aug 201219 Aug 2015Airbus Operations S.L.Aircraft tail surface with a leading edge section of undulated shape
US6733240 *18 Jul 200111 May 2004General Electric CompanySerrated fan blade
WO2014109670A2 *19 Nov 201317 Jul 2014Trubaev Nikolay AlekseevichMethod and apparatus for achieving laminar flow of gas or liquid near cutting edges
WO2014109670A3 *19 Nov 201323 Oct 2014Trubaev Nikolay AlekseevichMethod and apparatus for achieving laminar flow of gas or liquid near cutting edges
International ClassificationB64C21/02, B64C3/14, B63H1/26
Cooperative ClassificationB64C2230/20, B64C3/14, Y02T50/166, B64C2003/146, B64C21/02, B63H1/26
European ClassificationB64C3/14, B64C21/02, B63H1/26
Legal Events
11 Nov 1993AFIs addition to no.
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11 Jul 19968131Rejection